Manage Expectations
One cause of unhappiness and misery is your own expectations. If your expectations are too high, you will most likely be disappointed. One efficient approach would be to maintain low expectations or, better yet, “expect nothing.”
Yes, expect nothing! You might see this as a call to be slothful and helpless; however, this is not the case. What I believe one should do is work on two things at the same time, “do your best” and “expect nothing.”